Increasing the RIP Input Queue


You want to increase the size of the RIP input queue to prevent your low-speed router from losing routing information.


To increase the size of the shared RIP queue, use the input-queue configuration command:

Router2#configure terminal 
Enter configuration commands, one per line. End with CNTL/Z.
Router2(config)#router rip
Router2(config-router)#input-queue 200



This command allows you to control how much incoming RIP update information the router can hold before it has can process the information and integrate it into its routing table. Sometimes a router simply can't keep up with all of the information that it receives. This is most likely to be the case with less powerful routers on a busy network with many routes.

Bear in mind that each RIP update packet can hold up to 25 routes, and the default queue size is more than adequate to hold this many routes. So the input-queue size is only likely to be a problem if you have many times this number of routes, or if you have many routers all sharing the same segment. If this is the case, and you find that a less powerful router is randomly losing routes from its table, then it is relatively safe and easy to increase this queue depth.

The default value is 50. In this recipe, we have increased the queue depth to 200. This is a good starting point if you think that you have a queue depth problem. You can set this value to anything from 0 to 1024, although it is not clear why you would want to decrease the queue depth.

Recipe 6.10 shows another, alternative solution to this same problem. Instead of increasing the queue size on the slower router, you may opt to change the interpacket delay on the faster routers. And, in some cases, it may be necessary to combine both of these solutions.

See Also

Recipe 6.10

Router Configuration and File Management

Router Management

User Access and Privilege Levels


IP Routing





Frame Relay

Handling Queuing and Congestion

Tunnels and VPNs

Dial Backup

NTP and Time


Router Interfaces and Media

Simple Network Management Protocol





First Hop Redundancy Protocols

IP Multicast

IP Mobility




Appendix 1. External Software Packages

Appendix 2. IP Precedence, TOS, and DSCP Classifications


Cisco IOS Cookbook
Cisco IOS Cookbook (Cookbooks (OReilly))
ISBN: 0596527225
EAN: 2147483647
Year: 2004
Pages: 505

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